A non-incision method of vas occlusion based on the percutaneous injection of
polyurethane elastomer solution to form plugs is described. The results are based on clinical
experience in 12,000 men in which only 56 cases of minor complications were recorded.
Follow-up of 500 men for up to 3 years demonstrated an azoospermia rate of 98%. Plugs
have been removed from 86 men and, to date, 51 have made their wives pregnant. In those
from which the plugs have been removed for more than 1 year (n= 31), the pregnancy rate is …